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Preferred and Common Shares and Additional Paid in Capital - Equity (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 6 Months Ended
--- | --- | ---
Feb. 02, 2017 | Jun. 30, 2018 | Jun. 29, 2018
Class of Stock [Line Items] |  |  |
Offering expenses |  | $ 439 |
Private placement |  |  |
Class of Stock [Line Items] |  |  |
Common shares issued | 6,310,272 |  |
Price per share | $ 8.154 |  |
Proceeds from issuance of private placement | $ 50,597 |  |
Secondary offering |  |  |
Class of Stock [Line Items] |  |  |
Offering expenses |  | $ 439 |
Secondary offering | Oaktree Capital Management L.P. |  |  |
Class of Stock [Line Items] |  |  |
Common shares issued |  |  | 5,000,000
Price per share |  |  | $ 13.10
Oaktree and its affiliates | Private placement |  |  |
Class of Stock [Line Items] |  |  |
Common shares issued | 3,244,292 |  |

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